You clearly said that you were against the issue?
"I believe that the bible or any holy book for that matter should be used to justify a stance on an issue"
You clearly stated above that you think holy books should be used and then you said you were against it.

Technically, you conceded the debate, not I. You did not clearly stated that you were the one against the issue. You can give yourself as many points as you wish, but these points are not going to get you into the gates of heaven.

I believe that the bible should be used to justify a stance on an issue.

Even without the Bible, politicians are still going to justify actions and consequences by other means. The Bible is not their only resource, but rather just a way to further project their purposes. The Bible is a source well known to the public and therefore, its use would only be similar to the use of proverbs or idioms to express something. Since 70% of the American demographics are Christians, using the Bible would prove useful to justifying a stance on an issue.

The Bible would serve as a moral backbone for a justification. Regardless of whether Christianity was created by God or by the people, it serves as a moral guidance. The issue presented should be justified with morals rather than with immoral purposes. Therefore, the Bible should be used to justify political issues.